Hair trimming device



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R. P. M. DAyls ETAL 2,589,230

HAIR TRIMMING DEVICE:

March 18, 1952 Filed March 21, 1949 4 Sheets-Sheet 1 p/ 27 l?. V lllmmmmmn I EnmlAm'mvmuuum 2z 'al 29 24 2G l5 I9 @6.1.

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3. N0/@Baier SH/JEFFEQ jg INVENToRs l March 18, 1952 R. P. M. DAvls ETAL 2,589,230

HAIR TRIMMING DEVICE Filed March 2l, 1949 4 Sheets-Sheet 2 4l?. 5. INVENToRfs March 18, 1952 3.?. M. DAvls ETAL 2,589,230

1 HAIR TRIMMING DEVICE Filed March 2l, 1949 4 Sheets-Sheet 5 65 IN VEN TORS @Wagga/s March 18, .1952 R. P. M. DAVIS ETAL 2,589,230

. HAIR TRIMMING DEVICE Filed March 21, 1949 4 sheets-sheet 4 AC77 7' O/PNE 915 Patented Mar. 18, 1952 geles, Calif., assignors, by mesne assignments, to Cutter Corporation, a corporation of Delaware Application March 21, 1949, Serial No. 82,656

15 Claims.

This invention, relates to a hair trimming .de-

. vice of the general typeishown in the copending application of Roy P. M. Davis, Serial No, 691,448, led August 19, 1946, now Patent No. 2,519,954, dated August 22, 1950. This invention is particularly directed to improved mechanism for advancing and retracting the cutting blade. In the copending application of N orbert Shaeffer, Serial No. 69,8355, led January .1949, there is disclosed a nonreversible drive mechanism for ad.- vancing and retracting the sharpened blade with respect to the body of a comb.

It is object of our invention to provide an improved form of nonreversible drive in which the sharpened blade may be advanced or retracted to either of its extreme end positions Without the possibility that the parts of the device may become disassembled.

Another object is to provide a comb body having a movable carrier for a sharpened blade, the carrier being advanced and retracted by nonreversible drive and being held by a retainer member against inadvertent disassembly vwith respect to the comb body. Y

Another object is to provide addevice of this type in which the retainer, carrier and blade are insertable as a unit into operative position on the comb body.

Another object is .to provide adrive device Afor advancing and retracting the lcarrier relative-to the comb body and-retainer, the drive device fur. ther acting to lockthe retainer against disassembly from the comb body. i y

Another object is to provide .a blade carrier movable with respect to a retainer member having aV window opening. the carrier being pro- 'vided with an indicator movable in said window opening for indicating the position of the blade With respect to the comb body. A

Another object is to provide a nonreversible drive device for moving a sharpened blade rela.- tive to a comb body, the drive devicel incorporating a non-circular rotatable member provided with a peripheral cam groove.

Other and more detailed objects and advantages Ywill appear hereinafter.

In the drawings:

Figure 1 is a top plan view showing apreferred embodiment of our invention.

Figure 2 is a front elevation thereof,

Figure 3 is a rear elevation.

Figure 4 is a front elevation on an .enlarged scale partly broken away and showing the parts in position vcorresponding to thefully retracted position ofthe sharpenedblade.

Figure 5 is aview similar. to Figure .4 showing the parts Vin position corresponding .to thef-.ully

advanced position of the vsliarpened blade..

Figure 6-isa sectional view partly .broken :away taken substantially .on the lines 6.-.6 asshown in Figure 7 and illustrating the carrier, retainer and blade in partially assembled relationship with the comb body.

Figure '7 is a sectional view partly broken ,away

taken substantially on the link el-J'I as shown.

inFigure 4.

Figure 8 is aA transverse. sectional view Italien and I3 *extending from the opposite sidesoithe. comb body. Anintermediateseries of .teeth .I A.

connect the Vseries VII. with .the series .13.5 A sharpened blade L5 is connectedto acarrierql whichis movable relative tothe `comb body. I EIJ. The blade 4l 5 `is confined .between .the .flat Vsilirfae I-1 on the .body l0 and theunderside .t8 .of .are-

tainer generallydesignated I9. The. retainer UL9.

is provided witha seriesof teeth l2 ilwhich .oyer. lie .the body teeth I2 when the retaineris inoperative position. Avlip-2i at zone Y end of, the .body L9 provides la .grooveZZ for. reception ofthe. 4outer end v23 of the retainer i9. The 1inner V.endoftl'iev retainer i9 is provided Iwithapairof,spacedlugs 24 .and l25 positionednn extreme, edges ,ofthe retainer. The. comb body I 0. is yDIQyidei a.

ange 26 which defines a transverse slot Zibetween the .flange and the comb body. The lugzd" 0.11 the retainer.. I9 moves .through Tthis ,slqt.,2.1.int9

operative position, in which position the lug Y2,4, is received within therecess.235` and, thelug 2,5A is received within the recess .29.- Tlle retainer i9 remains xedrl its operative .position during normal use k0f `the device and is only wiihdrawnam the comb body when it is necessary to reverse` 0,1' replace lthe sharpened blade` I5. The carrierjijis provided with a RrQtuberanQe 3 0 .adapted iQ .ft within the longitudinal slot 3i provided in acenventional form of Gillette type safety razor blade. The carrier I6 slides within the transverse body slot 2'I and is guided thereby in its movement. A projecting tooth 32 or follower is provided on the carrier I6 and engages within a peripheral cam groove 33 provided on the control knob 34. Turning movement of the knob 34 then serves to advance and retract the carrier on the body by virtue of the inter-engagement between the follower 32 and the helical groove 33.

Referring more particularly to the detailed construction of the carrier I6 and retainer I9, a recess 35 is formed in the underside of the retainer I9 fr reception of the carrier I6 (see Figure 11) This recess extends for the full length of the carrier I6 but is considerably wider so that the carrier may move transversely relative thereto. A transverse rail 36 on the carrier I9 fits in sliding relationship within a groove 31 provided on the carrier so that movement of the carrier I6 is guided with respect to the retainer I9. An elongated window opening 38 in the retainer receives a projecting part 39 formed on the upper side of the carrier I6. An indicator or pointer 46 may be mounted on the upper surface of this projecting part 39 and may coact with indicia on the comb body I to indicate the relative position of the blade I with respect to the body IU. The indicia may take the form of a series of spaced parallel ribs 4I mounted on the overlapping flange 26. The projecting part 39 on the carrier I6 may taper slightly as shown clearly in Figure 7 so that the carrier I6 does not fall out of the retainer I9 when the latter is disassembled from the comb body I0. The degree of taper is such that the parts can be initially assembled by springing and distorting the projecting part 39 and the sides of the window opening 38 to an extent sufficient for insertion of the part 39 through the window opening 38. However, inadvertent disassembly is provented. The longitudinal protuberance 30 on the carrier I6 extends through the slot 3| in the sharpened blade I5 and into the clearance recess 42 provided in the comb body I0.

In addition to being guided by the rail 36 the carrier I6 is guided for movement with respect tr the comb body I0. A transverse recess 43 on the comb body receives the projecting guide 44 which extends transversely of the carrier.

The control knob 34 may be mounted in any convenient fashion for rotation on the comb body I0. As shown inthe drawings a pin 45 extends transversely of the comb body and is received in axially spaced sockets 46 and 4'I formed therein. The pin extends across an opening 48 which is provided in the body I0 and which receives kthe control knob 34. While the knob 34 may be fixed to the pin and the latter may be arrangedto rotate within the sockets 46 and 4'I, we prefer to fix the pin 45 in the sockets 46 and 4j and to provide clearance in the bore 49 of the knob 34 so that the knob rotates relative to the pin 4.5.

The control knob is provided with an axially extending slot 50 in its outer periphery which is proportioned to provide clearance for the lug 24 of the retainer I9 so that the latter may be moved into the recess 28 at the time of assembly. As shown in the drawings, the slot 50 is of shallower depth than the helix groove 33 and intersects this groove only at one end. The other end ofthe groove 33 terminates at 5I. One end of the slot-59 merges with the cylindrical surface 52 which extends angularly for a relatively short distance around the periphery of the knob 34. This cylindrical surface 52 dies out at 53 (see Figure 4). One side of this cylindrical surface 52 is bounded by the wedge surface 54 and the other by the lower face 55 of the knob 34.

The retainer I9, carrier I6 and blade I5 are insertable as a unit relative to the comb body I0. As shown in Figure 6 the retainer lug 24 passes along the axial slot 5D in the knob 34 to reach the recess 28. During the assembly operation the follower 32 of the carrier I6 enters the axial continuation 55 of the groove 33 which is in alignment with the relatively shallow slot 5U. When the lower lug 24 is fully received within the recess 28 the upper lug 25 is fully received within the recess 29 and its outer surface lies flush with the comb body I9 as shown in Figure 4. The wedge surface 54 on the knob 34 contacts the upper surface of the lower lug 24 to move it fully into the recess 28 in the event that it had not reached the bottom of the recess 28 during manual assembly. As the knob 34 is turned on the pin 45 the follower 32 is caused to travel in the helical groove 33 to move the carrier I6 and blade I5 relative to the retainer I9. Turning movement of the knob 34 away from the assembly position shown in Figure 6 serves to lock the retainer I9 relative to the comb body I9. This locking function is accomplished by the lower end face 55 of the knob 34 which then overlies the extreme end of the retainer lug 24.

When it is desired to remove the blade I5 for replacement or reversal the knob 34 is rotated to move the carrier follower 32 to its fully advanced position as shown in Figure 5. Rotary movement of the knob 34 is arrested when the side face 51 of the continuation groove 56 engages the follower 32. The knob cannot be rotated beyond this point, and therefore it is not possible to inadvertently move the carrier I6 beyond the position shown in Figure 5 through rotation of the knob. When rotation of the knob 34 is thus arrested the retainer I9 may be moved manually in a direction transverse of the comb body I0 and disassembled as shown in Figure 6. The above described construction constitutes a particularly advantageous feature of our invention since it enables us to use a nonreversing drive for the carrier and blade which has a positive stop for both advancing and retracting movement and without the possibility that the various parts may be inadvertently disassembled through rotation of the knob.

We prefer to form the knob 34 with a plurality of at sides rather than to make it of cylindrical form since the operation of the knob between the thumb and forefinger of the user is improved by the construction shown. We have found that although this has the effect of varying the depth of the helical groove 33, the follower 32 extends for a suicient' distance into the groove to avoid any disadvantageous effects.

While the particular form of comb teeth constitutes no part of our present invention, we prefer to use double teeth in the series I3 and single teeth in the series II, I2 and I4. As shown clearly in the drawings, the series I3 of double teeth includes alternating long and short recesses 58 and 59. The long recesses 58 extend from circular apertures 60 formed in the comb body. As shown in Figure 4 one edge of the sharpened blade projects into these apertures 60 when the blade is in the fully retracted position. The top side of the retainer I9 may lee-'provided with relatively -wide shallow grooves EfregiStering w-ith the circular apertures 60l in the-'comb body. A series Aof half round openings 62 may be provided inthe ylower edge ofthe retainer I9, and these are aligned with the shallow grooves 6l and with the circular apertures 60. Asshown in Figure 43 the backside of the comb bodymay also be provided with shallow grooves 63"'corresponding Vto the Ygrooves 6| so that the two sides of the hair trimming portion of the comb aresubstantially identical.

'Clearance grooves '64 are provided in the-comb body Aatthe ibase -of each of the double teethV in the-*series ll 3 landy extend-between adjacent circular apertures -GIJ to provide clearance for the sharpened edge of theblade4 I5.

Theterminonreversing as used in thisspecification yand inthe claims-is intended `tomean a drive-in-which the driven member is incapable of `becoming a driving `member and vice versa. More'speciiically, Athe term -is intended to -mea-n that the-'rotary element 21 cannot be driven byv the-follower lugor'tooth 26, butit is not intended to infer -bythe use of theV term nonreversing thatithe rotary element canbe rotated in one directiononly.

HavingV `fully describedr our invention, it isto bel-understood that we do -not wish to be -limited to the details herein set forth, but our invention isof'the `full scope of the-appended claims.

We claim:

V1. In a hair trimmingdevice, the combination of a comb-body, a carrier for a sharpened blade, means for mounting the carrier for movement relative to the comb body, cooperating parts on the comb body and carrier forming a drive for moving the carrier relative to the comb body, one of said parts including an element mounted for'turning movement on the comb body, and ya retainer lmemberon-the comb body heldin place by saidelement and arranged to limit movement of the carrier.

2. AInahair trimming device, the combination of a comb body, a blade carrier mounted for slidingrmovement relative to the comb body, a rotary element on the comb body and a follower element on the carrier cooperating -to form a nonreversible-drive formoving the carrier relative to the comb body, and a retainer member on the comb body held in place by said rotary element and arranged` tolimit'movement of the carrier.

3. In a hair trimming device, the combination of a combbody, a lblade carrierhaving a follower elementfixed thereto, a screw element mounted for rotation on the comb body and cooperating with Ithe-"follower elementto move the carrier on the comb body, *a retainer'member adapted to limit the extent of movement of the carrier, the rotary screw element and retainer member having interengaging surfaces for securing the retainer member in operative position on the comb body.

4. In a hair trimming device, the combinatie? of a comb body, a blade carrier having a follower element xed thereto at one end, an element mounted for rotation on the comb body having a helical groove cooperating with the follower element to move the carrier on the comb body, a retainer member adapted to limit the extent of movement of the carrier, the rotary element and retainer member having interengaging surfaces for securing the retainer member in operative position on the comb body.

5. In a hair trimming device, the combination of a comb body, a carrier for a sharpened blade,

provide-aguide for the carrier, cooperating parts.

onl thecomb body andcarrier forming a drive ifor moving the carrier relative to the comb body, one .of said parts including a rotary element mounted forturning movement on `the comb body, stopelementson the retainer arranged to limit movement of thev carrier, and a. lug Yon the retainer arranged -to engage an end face of the rotary element tov maintain `the retainer against displacement relative to the comb body.

6. In a hair trimming device, the combination of a combbody, a carrier fora sharpened blade, a retainer cooperating with the comb body to provide a guide for the carrier, a control knob mounted for rotation on the comb body and profvided with-a helical groove, a follower xed on the carrier and received in said groove `so that turning of thecontrol knob serves to advanceiand retract thecarrienstop elements on the retainer arranged to limit movement vof the carrier, andy a lug on the retainer arranged toengage an end face of the control knob to maintain `the retainer against displacement relative to the comb body.

7. In a hair trimming device, the combination of a comb body, a carrier fora sharpened blade, a retainer cooperating with the comb body to pro vide a guidev for the carrier, a control knob mounted for rotation on the comb body and provided with a helical groove, a follower fixed on the carrier and received in said groove so that turning of the control knob serves to advance and retract the carrier, the retainer having a window, a projection on the carrier extending through the window, and a lug on the retainer arranged to engage an end face of the control knobto maintain the retainer against displacement relative to the comb body.

8. In a hair trimming device, the combination of a -comb body, a carrier for a sharpened blade, a retainer cooperating with the comb body to enclose a major portion of said blade and to provide a guide for the carrier, a control knob mounted for rotation on the comb body at one end of the retainer and vprovided with a helical groove, a follower fixed on the carrier at one end and received in said groove so that turning of the knob serves to advance `and retract the carrier, the retainer having a window, a projection on the carrier extending through the window, and a lug on the retainer arranged to engage an end face of the control knob to maintain the retainer against displacement relative to the comb body.

9. Ina hair trimming device, the combination of a comb body, a carrier for a sharpened blade, a retainer cooperating with the comb body to provide a guide for the carrier, a control knob mounted for rotation on the comb body and provided with a helical groove, a follower fixed on the carrier and received in said groove so that turning of the knob serves to advance and retract the carrier, the retainer having a window, a projection on the carrier extending through the window, a lug on the retainer arranged to engage an end face of the control knob to maintain the retainer against displacement relative to the comb body, the control knob having an axially extending slot on its periphery providing clearance for the lug during movement of the retainer to operative position on the comb body.

10. In a hair trimming device, the combination of a comb body, a carrier for a sharpened blade, a retainer transversely insertable into fassen@` operative position on the comb body to provide a guide for the carrier, a control knob mounted for rotation on the comb body and provided with a helical groove, a follower xed on the carrier and received in said groove so that turning of the knob serves to advance and retract the carrier, the retainer having a window, a projection on the carrier extending through the window, an indicator on the projection cooperating with indicia on the comb body to provide a visual indication of the position of the blade on the comb body, a lug on the retainer arranged to engage an end face of the control knob to maintain the retainer against displacement relative to the comb body, the control knob having an axially extending slot in its periphery providing clearance for the lug for insertion and withdrawal of the retainer.

11. In a hair trimming device, the combination of a comb body, a blade carrier mounted for sliding movement transverse of the comb body, cooperating parts on the comb body and carrier forming a drive for moving the carrier relative to the comb body, one of said parts including a control knob mounted for turning movement on the comb body, a retainer having a window, a projection on the carrier extending through the window, a lug on the retainer arranged to engage an end face of the control knob to maintain the retainer against displacement relative to the comb body, the control knob having an axially extending slot on its periphery providing clearance for the lug during movement of the retainer to operative position on the comb body.

l2. In a hair trimming device, the combination of a comb body, a blade carrier mounted for sliding movement transverse of the comb body, cooperating parts on the comb body and carrier forming a drive for moving the carrier relative to the comb body, one of said parts including a control knob mounted for turning movement on the comb body, a retainer having a window, a projection on the carrier extending through the window andproportioned to prevent dis-assembly of the carrier and retainer, a lug on the retainer arranged to engage an end face of the control knob to maintain the retainer against displacement relative to the comb body, the control knob having an axially extending slot on its periphery providing clearance for the lug during movement of the retainer to operative position on the comb body.

13. In a hair trimming device, the combination of a comb body, a blade carrier mounted for sliding movement transverse of the comb body, a rotary element on the comb body cooperating with an element on the carrier for moving the carrier on the comb body, a retainer` insertable as a unit with the blade carrier into operative position on the comb body, a stop element on the retainer limiting relative movement of the carrier, the retainer having a lug engageable under a portion of the rotary element for maintaining the retainer in operative position. the rotary element having a slot in its periphery providing clearance for the lug when the retainer is inserted.

14. In a hair trimming device, the combination of a comb body. a blade carrier, a retainer transversely insertable with respect to the comb body to provide a guide for the carrier, a polygonal control knob mounted for rotation on the comb body and provided with a helix groove in its periphery, a follower on the carrier received in said groove so that turning movement of the control knob serves to advance and retract the carrier, the retainer having a stop element arranged to limit movement of the carrier, a lug on the retainer arranged to engage an end face on the control knob to maintain the retainer against displacement relative to the comb body, the control knob having a slot in its periphery adapted to provide clearance for the lug when the retainer is inserted to operative position.

15. In a hair trimming device, the combination of a comb body, a blade carrier, a retainer transversely insertable with respect to the comb body to provide a guide for the carrier, a polygonal control knob mounted for rotation on the comb body and provided with a relatively deep helix groove in its periphery, a follower on the carrier received in said groove so that turning movement of the control knob serves to advance and retract the carrier, the retainer having a stop element arranged to limit movement of the carrier, a lug on the retainer arranged to engage an end face on the control knob to maintain the retainer against displacement relative to the comb body, the control knob having a relatively shallow axial slot in its periphery intersecting the helix groove adapted to provide clearance for the lug when the retainer is inserted to operative position.

ROY P. M. DAVIS. NORBERT SI-IAEFFER.

REFERENCES CITED The following references are of record in the iile of this patent:

UNITED STATES PATENTS Number Name Date 1,789,234 Keenan 1 Jan. 13, 1931 2,134,839 Perkins Nov. 1. 1938 

